vector of sunrise/sunset times (e.g. 2008-12-01 08:30).
tSecond
vector of of sunrise/sunset times (e.g. 2008-12-01 17:30).
type
vector of either 1 or 2, defining tFirst as sunrise or sunset respectively.
twl
data.frame containing twilights and at least tFirst, tSecond and type (alternatively give each parameter separately).
degElevation
sun elevation angle in degrees (e.g. -6 for "civil
twilight")
distance
the maximal distance in km per units. Distances above
will be considered as unrealistic.
units
the time unite corresponding to the distance. Default is
"hour", alternative option is "day".
Details
Note that this type of filter significantly depends on the calibration
(degElevation). Especially during equinox periods. In contrast, the
(loessFilter) is independent from positions (uses twilight times)
and therefore superior.
Value
Logical vector. TRUE means the particular position passed the filter.